Less fit players, like DelPo, have the pressure to avoid the 5th set, leading to errors.

Fit guys like Nole can be more relaxed as they aren't afraid of long matches.

I know I get that, but the way Djokovic went to ride side of that 1st smash is pure luck, and Delpo's 2nd smash was just ridiculous how Nole got lucky again. Ofc its also DelPo's fault for not making that 2nd one.